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. dr. jon lapook has more. >> reporter: worrisome news for the more than 7 million americans who have taken chantix. a new analysis links the pill to a 72% increase in the risk of heart problems. johns hopkins dr. singh led the research. >> it is causing the same problems that we are trying to prevent, that's why it's not worth the risk. we need to prevent cardio disease among smokers, not increase. >> reporter: the review combines 14 studies involving more than 8,000 patients. while a 72% increased risk sounds alarming, the companion editorial titles, is it a heartbreaker? notes that cardiovascular problems including chest pain, heart attack and stroke are still rare. occurring in only about 1% of patients taking chantix. the drugmaker pfizer questions the way the analysis was conducted. dr. gail caldwell is vice president of medical affairs for pfizer. >> we will continue to do a more in-depth look as the fda is asking us to do but to date we have not seen evidence of important risks to the heart health of patients. from chantix. >> reporter: in mid june the fda warned chantix might
fast. he has a lot of other expenses too. >> let's switch gears and talk about the election. jon huntsman whose campaign literally has barely gotten off the ground and now making news today for the wrong reasons. one of his senior advisers is stepping down. what does it say for the huntsman campaign? >> reporter: that's right. jon huntsman's campaign manager susie wiles announced she is is leaving the campaign after a few months. huntman's guru john weaver said the campaign is moving in a more aggressive suggestion suggesting that susie wiles wasn't the one to take it on. huntsman isn't picking up any traction in the polls. his advisers say it's early and they are not concerned. his top people still are there. they are still on board. the question for huntsman, though, is whether that campaign can bring the voters back on board. >> all right. cbs' jan crawford, thank you. good to talk to you. >> you, too. >>> coming up on "the early show," going out of business sale begins today at borders book stores. in here, the planned combination of at&t and t-mobile would deliver our next g
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